netdev - Re: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <39acf3ae-031e-41fe-8343-9445775f312c@linux.dev>
Date: Tue, 13 Jan 2026 09:43:02 +0800
From: Leon Hwang <leon.hwang@...ux.dev>
To: kernel test robot <lkp@...el.com>, bpf@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau
 <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>,
 Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, "David S . Miller" <davem@...emloft.net>,
 David Ahern <dsahern@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H . Peter Anvin" <hpa@...or.com>, Matt Bobrowski
 <mattbobrowski@...gle.com>, Steven Rostedt <rostedt@...dmis.org>,
 Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Shuah Khan <skhan@...uxfoundation.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY
 flag for bpf_get_branch_snapshot helper

Hi kernel test robot,

Thanks for the test results.

No further testing is needed for this patch series, as it will not be
pursued further and is not expected to be accepted upstream.

Thanks again for the testing effort.

Thanks,
Leon

On 13/1/26 03:22, kernel test robot wrote:
> Hi Leon,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on bpf-next/master]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Leon-Hwang/bpf-x64-Call-perf_snapshot_branch_stack-in-trampoline/20260109-234435
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
> patch link:    https://lore.kernel.org/r/20260109153420.32181-3-leon.hwang%40linux.dev
> patch subject: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch_snapshot helper
> config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260112/202601122013.hmoeIXXs-lkp@intel.com/config)
> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260112/202601122013.hmoeIXXs-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202601122013.hmoeIXXs-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>>> ld.lld: error: undefined symbol: bpf_branch_snapshot
>    >>> referenced by bpf_trace.c:1182 (kernel/trace/bpf_trace.c:1182)
>    >>>               vmlinux.o:(bpf_get_branch_snapshot)
>    >>> referenced by bpf_trace.c:0 (kernel/trace/bpf_trace.c:0)
>    >>>               vmlinux.o:(bpf_get_branch_snapshot)
>